News Articles Not Showing on Search Engines

[MikuruX]

I'm having a rather small problem that I need help with. A staff member on my site has told me that none of the news articles we post on the site ever shows up when doing a search on Google, Bing.....well, pretty much any search engine. I'm kinda wondering if there was a configuration in the the IPB setting that I may have toggled that has done this because so far, I can't find any.

Website URL: www.animetoshokan.org

[opentype]

The posts are available to guests and not blocked through robots.txt. There isn’t much more to do. And Google has articles indexed. See here. 

The problem I see: Some of the posts have hardly any text. Just a video or pictures. That’s not very good for an “article” to appear in search engines.